Antireflection Article with Dual-Surface Convex Structures
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Solution Overview
Problem
Antireflection articles with fine concave-convex structures suffer from low mechanical strength and abrasion resistance, leading to deterioration of the antireflective function when touched, and exhibit wavelength-dependent reflectance, making it difficult to suppress reflection across the visible light range.
Innovation Solution
An antireflection article with convex portions on both surfaces, where the average gap is 400 nm or less, and the height-to-width ratio is optimized to provide sufficient abrasion resistance and low reflectance across the visible light range, with the first surface designed for touch resistance and the second surface for reduced wavelength dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the convex portions are made very small to achieve antireflection effect, then the antireflective function is improved, but the mechanical strength and abrasion resistance deteriorate
Solution Approach 1:
The patent transitions from considering only the size of convex portions to considering the aspect ratio (height-to-width ratio) as a critical dimension. By optimizing the aspect ratio to be 2.0 or more, the patent achieves both antireflection performance and mechanical strength simultaneously, resolving the contradiction between small convex portion size and structural integrity.
2Strength
If the aspect ratio of convex portions is reduced to increase mechanical strength, then the mechanical strength is improved, but the wavelength dependency of reflectance increases
Solution Approach 1:
The patent applies parameter changes by setting the aspect ratio of convex portions to 2.0 or more, which simultaneously satisfies both mechanical strength requirements and antireflection performance across the visible light spectrum. This parameter optimization eliminates the trade-off between strength and optical performance.
3Reliability
If the aspect ratio of convex portions is increased to improve abrasion resistance, then the abrasion resistance is improved, but the reflectance suppression becomes wavelength-dependent
Solution Approach 1:
By optimizing the aspect ratio parameter to be 2.0 or more, the patent achieves both high abrasion resistance and uniform reflectance suppression across all visible wavelengths, eliminating the wavelength dependency problem that occurs with other aspect ratios.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The antireflection article achieves high abrasion resistance and low reflectance throughout the visible light range, ensuring the antireflective function remains effective even when touched, while minimizing wavelength-dependent reflectance.
Implementation Method 1
a fine concave-convex structure called a moth-eye structure has been known as effective antireflection means because a refractive index continuously increases from the refractive index of air to the refractive index of the material of the article
Data Source
AI summary
The present invention relates to an antireflection article of which the first surface has sufficient abrasion resistance and can suppress reflectance to a low level throughout the visible light region, and a display device. The present invention relates to an antireflection article that has light transmittance, in which a plurality of convex portions are disposed on a first surface positioned at a visible side and a second surface opposite to the first surface, the average gap of the convex portions is 400 nm or less, the ratio (H1/W1) of the height H1 of the convex portions and the width W1 of the bottoms of the convex portions is 1.3 or more, in the first surface, and the ratio (H2/W2) of the height H2 of the convex portions and the width W2 of the bottoms of the convex portions is larger than the ratio (H1/W1), in the second surface.